【作者】 王一龙； 李维； 赵素玲； 陈志宏； 官建国；

【Author】 Yilong Wang;Wei Li;Suling Zhao;Zhihong Chen;Jianguo Guan;School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology;Center for Material Research and Analysis, Wuhan University of Technology;School of Science, Wuhan University of Technology;

【机构】 武汉理工大学化学化工与生命科学学院； 武汉理工大学材料复合新技术国家重点实验室； 武汉理工大学材料研究与测试中心； 武汉理工大学理学院；

【摘要】 表面包银或镍核壳复合粒子是导电与电磁屏蔽复合材料中的关键组成部分,其好坏直接制约着该类复合材料的性能。针对目前表面包银核壳复合粒子存在银含量高、密度大,与聚合物相容性差以及易发生银迁移等问题,本文首先揭示了增加银晶核的异相成核数能有效降低复合粒子的壳层厚度这一重要规律,并提出了在内核粒子表面致密包覆薄银壳的化学自组装-复合还原剂液相制备技术,成功制备出3种表面包银核壳复合粒子。与其他制备方法获得的或商品化的同类型样品相比,这些核壳粒子的复合材料具有更优异的导电率、屏蔽效能、抗沉降性、电性能稳定性以及银迁移性能,表明其在导电与电磁屏蔽复合材料领域具有重要的应用前景。此外,发展了基于静电吸附控制异相成核位点制备壳层致密的镍包石墨核壳复合粒子这一合成技术,解决了该类填料壳层不致密和导电性差等技术难题。研究发现:该复合粒子具有优异的电磁特性,表明其在电磁兼容复合材料领域具有广泛的应用前景。更多还原

【Abstract】 This work for the first time revealed that increasing the number of metal nuclei on inner-core particles reduces the mininum thickness of compact Ag shell of composite particles. Silver-coated composite particles have been developed by electroless plating on self-assembly functionalization-layer of the cores by composite reductants. Compared with composite materials of other synthesized or commercial silver-coated composite particles, those of the as-synthesized silver-coated composite particles show excellent conductivity, strong shielding effectiveness, good anti-sedimentation, high conducting stability and excellent performance of silver migration resistance, suggesting that they are promising materials for applications in the fields of conductive and electromagnetic shielding composite materials, and microelectronic device. Additionally, we have demonstrated a novel fabrication approach of nickel-coated graphite composite particles with compact shells by controlling heterogeneous nucleation based on electrostatic adsorption between nickel ions and cores, which improved such technical problems as incomplete shells or poor conductivity of literature-reported composite particles.更多还原